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The cross section of a canal is a trapezium in shape . If the canal is a trapezium in shape. If the canal is 10 meters wide at the top and 6 meters wide at bottom and the area of cross section is 640 sq. meters The depth of canal is ?
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- 40 meters
- 80 meters
- 160 meters
- 384 meters
Correct Option: B
Cross section area = 1/2 x ( a + b ) x d
where a and b are the parallel sides, d is the perpendicular distance between them.
⇒ 1/2 x ( a + b ) x d = 640
⇒ d = (640 x 2) / 16 = 80m
